نتایج جستجو برای: photooxidation

تعداد نتایج: 1233  

2015
Roeland Jozef Gentil De Moor Jeroen Verheyen Andrii Diachuk Peter Verheyen Maarten August Meire Peter Jozef De Coster Filip Keulemans Mieke De Bruyne Laurence James Walsh

The use of optical radiation for the activation of bleaching products has not yet been completely elucidated. Laser light is suggested to enhance the oxidizing effect of hydrogen peroxide. Different methods of enhancing hydrogen peroxide based bleaching are possible. They can be classified into six groups: alkaline pH environment, thermal enhancement and photothermal effect, photooxidation effe...

Journal: :Organic letters 2010
Balaji Purushothaman Sean R Parkin John E Anthony

The synthesis of new silylethyne-substituted hexacene derivatives to investigate their solubility, stability, and pi-stacking is reported. It was found that "butterfly" dimerization, rather than photooxidation, is the dominant decomposition pathway for these molecules and that stability can be enhanced by functionalization to prevent close contact between specific regions of the aromatic core. ...

Journal: :Frontiers in Marine Science 2021

During the Deepwater Horizon (DWH) blowout, photooxidation of surface oil led to formation persistent photooxidized compounds, still found in shoreline sediments a decade later. Studies demonstrated that modified both biodegradation rates and effectiveness aerial dispersant applications. Despite significant consequences this weathering pathway, lack measurements prevented be accounted for DWH b...

2014
Joshua P Barham Matthew P John John A Murphy

Nucleophilic trapping of iminium salts generated via oxidative functionalisation of tertiary amines is well established with stabilised carbon nucleophiles. The few reports of organometallic additions have limited scope of substrate and organometallic nucleophile. We report a novel, one-pot methodology that functionalises N-substituted tetrahydroisoquinolines by visible light-assisted photooxid...

Journal: :Journal of Marine Science and Engineering 2022

Over the past century, demand for petroleum products has increased rapidly, leading to higher oil extraction, processing and transportation, which result in numerous spills coastal-marine environments. As spilled can negatively affect ecosystems, its transport fates captured a significant interest of scientific community regulatory agencies. Typically, environment natural mechanisms (e.g., phot...

Journal: :Plant physiology 1969
T Yamashita W L Butler

Irradiation of tris-washed chloroplasts with moderate intensities of red light caused a partial bleaching of chloroplast pigments and an inhibition of the hydroquinone-supported photoreduction of NADP. The presence of an electron donor for photosystem 2 (PS2) during the irradiation prevented the bleaching and inhibition. It is concluded that the strong oxidant produced by PS2 accumulates in tri...

2007

Acrolein may be released to the environment in emissions and effluents from its manufacturing and use facilities, in emissions from combustion processes (including cigarette smoking and combustion of petrochemical fuels), from direct application to water and waste water as a slimicide and aquatic herbicide, as a photooxidation product of various hydrocarbon pollutants found in air (including pr...

2007

Acrolein may be released to the environment in emissions and effluents from its manufacturing and use facilities, in emissions from combustion processes (including cigarette smoking and combustion of petrochemical fuels), from direct application to water and waste water as a slimicide and aquatic herbicide, as a photooxidation product of various hydrocarbon pollutants found in air (including pr...

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